From the effects of interfering with Rac1 and Prex1 alone, it can be seen that the effect of interference with Rac1 on cell viability, apoptosis, and migration of gastric cancer cells is significantly higher than that of the Prex1 interference group, indicating that Prex1 interference has little effect on Rac1 in gastric cancer cells. The gene discussed is PREX1; the disease is gastric cancer.